A METHOD AND A COMMUNICATIONS NETWORK FOR UPDATING THE ROUTING DATA OF A DOMAIN NAME SERVER

摘要

The invention relates to a method and a communications network of updating a domain name server's (DNS) routing data when a second mobile terminal (TB) that has been the customer of a second operator's communications network (OPB) changes operators becoming the customer of a third operator's communications network (OPC) while retaining the telephone number. In the method, the third operator submits a transfer request for the change of the second mobile terminal's (TB) operator to a database server (DB), after which the time-to-live of the responses given to the enquiries sent to the domain name server (DNS) is reduced stepwise down to a predetermined maximum value. After this, the database server (DB) updates the domain name server's routing data in respect of the second mobile terminal (TB) to indicate the third operator's data communications network (OPC) and changes said time-to-live back to original.